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How do I know when I need to use an external scripting language, vs the iMacro editor?

Ultimately, I'd like to fill a form on many embedded devices where their IP addresses are in a CSV. Right now, I don't understand how loops or variables work in the editor. I've seen some mention of a "Play Loop" button.

Where/when is the line of demarcation between building the script in the iMacro editor vs some external engine?Why don't I have a PowerShell option in the editor? I see Javascript, VB, c# and "se-J", but no PowerShell or mention of batch files.How do loops work? I'm used to programming languages, including VBA, that have a defined structure and variable. I have not found a page explaining the loop syntax.If I want to construct the URL on the fly, how would I do so? I haven't started looking for this yet, but the way variables work is also unclear.